Cherry pick PR #3357: Migrate to pthread_mutex/pthread_cond #300

Job	Run time
raspi-2 / initialize	43s
raspi-2-skia / initialize	48s
raspi-2 / docker-build-image	1m 29s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / docker-build-image	1m 25s
raspi-2-skia / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	14m 50s
raspi-2-skia / raspi-2-skia_debug	17m 34s
raspi-2-skia / raspi-2-skia_qa	10m 3s
raspi-2-skia / raspi-2-skia_gold	10m 3s
raspi-2 / raspi_devel	14m 45s
raspi-2 / raspi_debug	18m 12s
raspi-2 / raspi_qa	10m 5s
raspi-2 / raspi_gold	10m 6s
raspi-2 / sbversion-15_devel	16m 2s
raspi-2 / sbversion-15_debug	18m 1s
raspi-2 / sbversion-15_qa	10m 26s
raspi-2 / sbversion-15_gold	9m 49s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	2h 44m 21s

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